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#include <inttypes.h>
#include <ctype.h>
#include <string.h>
#include "_format.h"
static char *length_names[] = {
[L_hh] = "hh",
[L_ll] = "ll",
[L_h] = "h",
[L_l] = "l",
[L_j] = "j",
[L_z] = "z",
[L_t] = "t",
[L_L] = "L",
};
size_t __conv(const char *format, struct io_conversion *conv, va_list arg)
{
size_t ret = 0;
if (format[0] != '%') {
return 0;
}
ret++;
conv->flags = 0;
conv->length = L_default;
while (strchr("*-+ #0", format[ret])) {
switch (format[ret]) {
case '*': conv->flags |= F_STAR; break;
case '-': conv->flags |= F_LEFT; break;
case '+': conv->flags |= F_SIGN; break;
case ' ': conv->flags |= F_SPACE; break;
case '#': conv->flags |= F_ALT; break;
case '0': conv->flags |= F_ZERO; break;
}
if (conv->dir == IO_IN) {
if ((conv->flags & ~(F_STAR)) != 0) {
UNDEFINED_FMT(conv, "Flag '%c' is not valid for formatted input", format[ret]);
}
} else {
if (conv->flags & F_STAR) {
int width = va_arg(arg, int);
conv->flags |= F_WIDTH;
if (width < 0) {
conv->flags |= F_LEFT;
conv->width = -width;
} else {
conv->width = width;
}
}
}
ret++;
}
if (isdigit(format[ret])) {
char *end = NULL;
conv->flags |= F_WIDTH;
conv->width = strtoumax(format + ret, &end, 10);
ret += (size_t)(end - (format + ret));
}
if (format[ret] == '.') {
if (conv->dir == IO_IN) {
UNDEFINED("Precision is not supported for formatted input");
}
conv->flags |= F_PRECISION;
ret++;
if (format[ret] == '*') {
int prec = va_arg(arg, int);
if (prec > 0) {
conv->precision = prec;
} else {
conv->flags &= ~(F_PRECISION);
}
} else {
char *end = NULL;
conv->precision = strtoumax(format + ret, &end, 10);
ret += (size_t)(end - (format + ret));
}
}
for (size_t i = 0; i < sizeof(length_names) / sizeof(length_names[0]); i++) {
if (length_names[i] && strncmp(length_names[i], format + ret, strlen(length_names[i])) == 0) {
conv->length = (enum conversion_length)i;
ret += strlen(length_names[i]);
break;
}
}
conv->spec = format[ret];
if (isupper(conv->spec)) {
conv->flags |= F_UPPER;
}
switch (conv->spec) {
case 'd':
case 'i':
if (conv->length == L_L) {
UNDEFINED_FMT(conv, "Length '%s' is not supported with conversion specifier '%c'", length_names[conv->length], conv->spec);
}
break;
case 'o':
case 'u':
case 'x':
case 'X':
if (conv->length == L_L) {
UNDEFINED_FMT(conv, "Length '%s' is not supported with conversion specifier '%c'", length_names[conv->length], conv->spec);
}
break;
case 'f':
case 'F':
case 'e':
case 'E':
case 'g':
case 'G':
case 'a':
case 'A':
if (conv->length != L_L && conv->length) {
UNDEFINED_FMT(conv, "Length '%s' is not supported with conversion specifier '%c'", length_names[conv->length], conv->spec);
}
break;
case 'c':
if (conv->flags & F_PRECISION) {
UNDEFINED_FMT(conv, "Precision is not supported with conversion specifier '%c'", conv->spec);
}
/* FALLTHRU */
case 's':
case '[':
if (conv->length != L_l && conv->length) {
UNDEFINED_FMT(conv, "Length '%s' is not supported with conversion specifier '%c'", length_names[conv->length], conv->spec);
}
break;
case 'p':
case 'n':
case '%':
if (conv->flags & F_WIDTH) {
UNDEFINED_FMT(conv, "Field width is not supported with conversion specififier '%c'", conv->spec);
}
if (conv->flags & F_PRECISION) {
UNDEFINED_FMT(conv, "Precision is not supported with conversion specififier '%c'", conv->spec);
}
if (conv->flags) {
UNDEFINED_FMT(conv, "Flags are not supported with conversion specifier '%c'", conv->spec);
}
if (conv->length) {
UNDEFINED_FMT(conv, "Length '%s' is not supported with conversion specifier '%c'", length_names[conv->length], conv->spec);
}
break;
default:
UNDEFINED_FMT(conv, "Unknown conversion specifier '%c'", conv->spec);
}
return ret;
}
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